RTC Usage Example

#include "rtc_if.h"
int32_t RtcAlarmACallback(enum RtcAlarmIndex alarmIndex)
{
    if (alarmIndex == RTC_ALARM_INDEX_A) {
        /* Process alarm A. */
        printf("RTC Alarm A callback function\n\r");
    } else if (alarmIndex == RTC_ALARM_INDEX_B) {
        /* Process alarm B. */
        printf("RTC Alarm B callback function\n\r");
    } else {
    /* Process the error. */
    }
    return 0;
}

void RtcTestSample(void)
{
    int32_t ret;
    struct RtcTime tm;
    struct RtcTime alarmTime;
    uint32_t freq;
    DevHandle handle = NULL;

    /* Obtain the RTC device handle. */
    handle = RtcOpen();
    if (handle == NULL) {
        /* Process the error. */
    }
    /* Register RtcAlarmCallback for alarm A. */
    ret = RtcRegisterAlarmCallback(handle, RTC_ALARM_INDEX_A, RtcAlarmACallback);
    if (ret != 0) {
        /* Process the error. */
    }
    /* Set the RTC external crystal frequency. Note that the frequency must be configured in accordance with the requirements specified in the product manual of the in-use component. */
    freq = 32768; /* 32768 Hz */
    ret = RtcSetFreq(handle, freq);
    if (ret != 0) {
        /* Process the error. */
    }
    /* Enable the RTC alarm interrupts. */
    ret = RtcAlarmInterruptEnable(handle, RTC_ALARM_INDEX_A, 1);
    if (ret != 0) {
        /* Process the error. */
    }
    /* Set the RTC time to 2020/01/01 00:00:10 .990. */
    tm.year = 2020;
    tm.month = 01;
    tm.day = 01;
    tm.hour= 0;
    tm.minute = 0;
    tm.second = 10;
    tm.millisecond = 990;
    /* Write the RTC time information. */
    ret = RtcWriteTime(handle, &tm);
    if (ret != 0) {
        /* Process the error. */
    }
    /* Set the RTC alarm time to 2020/01/01 00:00:30 .100. */
    alarmTime.year = 2020;
    alarmTime.month = 01;
    alarmTime.day = 01;
    alarmTime.hour = 0;
    alarmTime.minute = 0;
    alarmTime.second = 30;
    alarmTime.millisecond = 100;
    /* Set the alarm time information for RTC_ALARM_INDEX_A. When the specified time is reached, "RTC Alarm A callback function" is printed. */
    ret = RtcWriteAlarm(handle, RTC_ALARM_INDEX_A, &alarmTime);
    if (ret != 0) {
        /* Process the error. */
    }

    /* Read the RTC real time. */
    ret = RtcReadTime(handle, &tm);
    if (ret != 0) {
        /* Process the error. */
    }
    sleep(5)
    printf("RTC read time:\n\r");
    printf("year-month-date-weekday hour:minute:second .millisecond %04u-%02u-%02u-%u %02u:%02u:%02u .%03u",
        tm.year, tm.month, tm.day, tm.weekday, tm.hour, tm.minute, tm.second, tm.millisecond);
    /* Release the RTC device handle. */
    RtcClose(handle);
}